Borderlands downloadable content for The Zombie Island of Dr. Ned and Mad Moxxi's Underdome Riot will be released as an add-on package at Gamestop. Originally The Zombie Island of Dr. Ned was the first DLC for Borderlands and Mad Moxxi's Underdome Riot was the second to be released. The Island of Dr. Ned DLC features new quests, enemy types, and environments. Mad Moxxi DLC features new games modes such as enemy health regeneration, low gravity fighting, a weapon chest and shieldless fighting.

This add-on pack will be available at Gamestop for the Xbox 360 and PC, retailing for $19.99. The ship dates for the Xbox 360 version is April 4, 2010 and for the PC it is February 23, 2010.